High-voltage switch contact structure

Abstract

The utility model relates to the technical field of high-voltage switches, in particular to a high-voltage switch contact structure, which comprises a moving contact, a static contact and an arc extinguish chamber, an air cylinder is arranged at the top of the arc extinguish chamber, the static contact is arranged at the bottom of an inner cavity of the arc extinguish chamber through a spring, the moving contact penetrates through the air cylinder and is inserted into the arc extinguish chamber, and the moving contact and the static contact are provided with guide pins. The end part of the air cylinder is also provided with a pressing rod, and the moving contact is provided with a pressing ring. An interlayer is arranged in the side wall of the arc extinguish chamber, and a winding group and an exhaust pipe are arranged in the interlayer; the beneficial effects of the utility model are that when an electric arc is generated between the moving contact and the static contact, the guide pin can guide the electric arc to the arc extinguishing ring, and the electric arc on the guide pin is continuously cut by the arc extinguishing ring along with the movement of the moving contact; and meanwhile, due to the fluid channeling of the arc and the arc extinguishing teeth arranged on the arc extinguishing ring, the arc can be cut for multiple times, so that the arc is divided into smaller arc sections, and finally, rapid extinguishing is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to high pressure switch technical field, concretely relates to a high pressure switch contact structure. BACKGROUND

[0002] With the continuous development of power system, the role of switch electric appliance in power system is more and more important. As the core structure of high voltage switch, contact assumes the important responsibility of closing and opening. In recent years, with the application of high voltage switch in high voltage, high current power system more and more common, the performance requirement of switch contact is also higher and higher. High voltage switch can make the arc current between contacts form the longitudinal magnetic field parallel to them through specific contact structure, the longitudinal magnetic field acts on arc current, can make the ion near the anode greatly increase, reduce arc voltage, reduce the ablation to contact, make diffusion type arc turn to cluster type arc, improve the arc extinguishing ability of arc extinguishing chamber. In order to improve the arc extinguishing performance, arc extinguishing chamber usually increases the diameter of contact, but blindly increasing the diameter of contact will lead to the excessive quality of contact, waste too much operating power, also will lead to the excessive load of mechanism, and will affect the overall life of arc extinguishing chamber in the long run.

[0003] In order to solve the above problems, the present application provides a high voltage switch contact structure. SUMMARY

[0004] The utility model discloses a high voltage switch contact structure to solve the problem in the background art.

[0005] To achieve the above object, a high voltage switch contact structure is provided, which comprises a moving contact, a static contact and an arc extinguishing chamber. The top of the arc extinguishing chamber is provided with a gas cylinder. The static contact is arranged at the bottom of the inner cavity of the arc extinguishing chamber through a spring. The moving contact penetrates the gas cylinder and is inserted into the arc extinguishing chamber. The periphery of the moving contact and the static contact is provided with a guide pin. The end of the gas cylinder is further provided with a pressing rod. The periphery of the moving contact is provided with a pressing ring matched with the pressing rod.

[0006] The side wall of the arc extinguishing chamber is provided with a sandwich layer. A winding group and an exhaust pipe are arranged in the sandwich layer. The exhaust pipe is communicated with the inside of the gas cylinder. The inner wall of the arc extinguishing chamber is provided with a nozzle communicated with the exhaust pipe.

[0007] The inner wall of the arc extinguishing chamber is provided with an arc extinguishing ring. The end of the arc extinguishing chamber is further provided with an exhaust hole.

[0008] Further, the gas cylinder is in the form of a circular ring structure and is filled with sulfur hexafluoride gas. The pressing rod is located inside the arc extinguishing chamber. The gas outlet hole of the gas cylinder is connected with the nozzle through the exhaust pipe. The moving contact can move up and down in the opening hole in the middle of the gas cylinder. The outer diameter of the pressing ring is larger than the diameter of the opening hole in the middle of the gas cylinder.

[0009] Further, the number of arc-extinguishing rings is several, and the arc-extinguishing rings are arranged equidistantly along the inner wall of the arc-extinguishing chamber from top to bottom, and the inner wall of the arc-extinguishing ring is provided with sawtooth-shaped arc-extinguishing teeth in a ring shape.

[0010] Further, the guide needle is in a conical structure, and the guide needles are arranged in a ring shape.

[0011] Further, the exhaust hole is provided with a one-way exhaust valve, which allows gas to be discharged from the arc-extinguishing chamber and does not allow gas to enter.

[0012] Further, a sealing ring is arranged between the contact surface of the moving contact and the air cylinder.

[0013] Further, the inner cavity bottom of the arc-extinguishing chamber is provided with a limiting tube, and the static contact is inserted into the limiting tube through a spring.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] Under the cooperation of the arc-extinguishing ring and the guide needle, when the arc is generated between the moving contact and the static contact, the guide needle can guide the arc to the arc-extinguishing ring and the arc on the guide needle is continuously cut by the arc-extinguishing ring, so that the arc is divided into small segments, and the arc is cut multiple times due to the self-streaming of the arc and the arc teeth on the arc-extinguishing ring, so that the arc is divided into smaller arc segments, and finally the arc is quickly extinguished.

[0016] When the moving contact and the static contact are separated, the pressing ring on the moving contact also extrudes the pressing rod, so that the sulfur hexafluoride gas in the air cylinder is extruded into the exhaust pipe and is sprayed out through the nozzle. Since the sulfur hexafluoride gas belongs to a strong electronegative gas, the molecules of the gas easily absorb free electrons to form negative ions with large mass, which weakens the collision ionization process of the arc in the arc-extinguishing chamber. The sprayed gas is discharged through the one-way exhaust hole, and the high-pressure gas in the arc-extinguishing chamber can also be discharged together, so that the temperature inside the arc-extinguishing chamber is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is an internal structure schematic view of the utility model;

[0018] Fig. 2 It is a structure schematic view of the utility model;

[0019] Fig. 3 It is a structure schematic view of the arc-extinguishing ring in the utility model.

[0020] The meanings of the various reference numerals in the drawings are as follows:

[0021] 1. moving contact; 2. stationary contact; 3. arc extinguishing chamber; 4. air cylinder; 5. spring; 6. guide needle; 7. pressing rod; 8. pressing ring; 9. winding set; 10. exhaust pipe; 11. nozzle; 12. arc extinguishing ring; 13. exhaust hole; 14. arc extinguishing tooth. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0023] Those skilled in the art can understand that, unless specifically stated, the singular forms "a", "an" and "said" used herein also include the plural forms. It should be further understood that the word "comprise" used in the specification of the present application means that the features, integers, steps, operations, elements and / or components exist, but does not exclude the existence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0024] Please refer to Figs. 1-3 As shown in the drawings, a high-voltage switch contact structure is provided, which is applied to a high-voltage switch and comprises a moving contact 1, a stationary contact 2 and an arc extinguishing chamber 3. The top of the arc extinguishing chamber 3 is provided with an air cylinder 4. The stationary contact 2 is arranged at the bottom of the inner cavity of the arc extinguishing chamber 3 through a spring 5. The moving contact 1 penetrates through the air cylinder 4 and is inserted into the arc extinguishing chamber 3. Guide needles 6 are arranged at the peripheral edges of the moving contact 1 and the stationary contact 2. The end of the air cylinder 4 is further provided with a pressing rod 7. The peripheral edge of the moving contact 1 is provided with a pressing ring 8 matched with the pressing rod 7.

[0025] A sandwich layer is arranged in the side wall of the arc extinguishing chamber 3. A winding set 9 and an exhaust pipe 10 are arranged in the sandwich layer. The exhaust pipe 10 is in communication with the inside of the air cylinder 4. The inner wall of the arc extinguishing chamber 3 is provided with a nozzle 11 in communication with the exhaust pipe 10. The winding set 9 is connected to three-phase alternating current, so as to generate a magnetic field between the moving contact 1 and the stationary contact 2.

[0026] The inner wall of the arc extinguishing chamber 3 is provided with arc extinguishing rings 12. The end of the arc extinguishing chamber 3 is further provided with exhaust holes 13.

[0027] The number of the arc extinguishing rings 12 is several, and the arc extinguishing rings 12 are arranged equidistantly along the inner wall of the arc extinguishing chamber 3 from top to bottom. The inner wall of the arc extinguishing ring 12 is annularly provided with sawtooth-shaped arc extinguishing teeth 14.

[0028] In the embodiment, the moving contact 1 moves downward to connect with the static contact 2 and realize closing, the spring below the static contact 2 and the limiting tube can allow the static contact 2 to produce a certain displacement, so as to avoid the moving contact 1 from repeatedly colliding due to the reaction force and producing more arc;

[0029] In the contact process of the moving contact 1 and the static contact 2, arc is generated between them, the arc is guided by the guide needle 6 to the arc extinguishing ring 12 on the arc extinguishing chamber 3 at the first time, and the energized winding set 9 generates a magnetic field between the moving contact 1 and the static contact 2, at this time, the winding set is equivalent to the stator in the asynchronous motor, and the arc is equivalent to the rotor, which rotates around the moving contact 1 and the static contact 2 under the action of the magnetic field; and in the contact process of the two, the moving contact 1 is in a state of continuous movement, and the arc also moves downward under the action of the guide needle 6, which is cut into small arcs by the arc extinguishing ring 12, the small arcs rotate under the action of the magnetic field, and are further cut off by the arc extinguishing teeth 14 inside the arc extinguishing ring 12 to form smaller arcs, and finally quickly extinguish;

[0030] When the moving contact 1 and the static contact 2 are separated, the pressing ring 8 on the moving contact 1 will also extrude the pressing rod 7, so as to extrude the sulfur hexafluoride gas in the air cylinder 4 into the exhaust pipe 10, and then sprayed out through the nozzle 11. Since the sulfur hexafluoride gas belongs to strong electronegative gas, its molecules are easy to adsorb free electrons to form negative ions with large mass, which weakens the collision ionization process of the arc in the arc extinguishing chamber 3. The sprayed gas is discharged through the one-way exhaust hole 13, and at the same time, the high-pressure gas in the arc extinguishing chamber 3 can also be discharged, so as to reduce the temperature inside the arc extinguishing chamber 3. Embodiment

[0031] Based on the above embodiment, as shown in Figs. 1-2 The air cylinder 4 has a circular ring structure, the pressing rod 7 is located inside the arc extinguishing chamber 3, the gas outlet hole of the air cylinder 4 is connected with the nozzle 11 through the exhaust pipe 10, the moving contact 1 can move up and down in the opening hole in the middle of the air cylinder 4, and the outer diameter of the pressing ring 8 is larger than the diameter of the opening hole in the middle of the air cylinder 4; since the outer diameter of the pressing ring 8 is larger than the diameter of the opening hole in the middle of the air cylinder 4, the moving contact 1 will not completely separate from the static contact 2 when the two are separated, and the large outer diameter of the pressing ring 8 is also convenient for extruding the pressing rod 7;

[0032] It needs to be specially noted that the guide needle 6 is in a conical structure, and several guide needles 6 are arranged in a ring shape, and in the process of contact or separation of the moving contact 1 and the static contact 2, especially the guide needle 6 arranged on the moving contact 1 always moves with the moving contact 1, and in the moving process, once an arc is generated between the moving contact 1 and the static contact 2, the arc will continuously pass through the arc extinguishing ring 12 under the guidance of the guide needle 6, and the arc extinguishing ring 12 will cut the arc into several small arcs in the process, and cooperating with the natural movement of the arc, the arc extinguishing ring 12 can cut the arc for multiple times through cooperation with the guide needle 6;

[0033] In the embodiment, in order to realize better sealing effect, the sealing ring is arranged between the contact surface of the moving contact 1 and the air cylinder 4; in order to ensure that the connection of the moving contact 1 and the static contact 2 is safer, the limiting tube is arranged at the bottom of the inner cavity of the arc extinguishing chamber 3, so that the static contact 2 is only allowed to move up and down along the limiting tube to a certain extent.

[0034] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by the person skilled in the art that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification are only preferred examples of the utility model, and are not used to limit the utility model, and the utility model will have various changes and improvements without departing from the spirit and range of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A high-voltage switch contact structure comprising a moving contact (1), a stationary contact (2) and an arc chamber (3), characterized in that: The top of the arc extinguishing chamber (3) is provided with a cylinder (4), the static contact (2) is arranged at the bottom of the inner cavity of the arc extinguishing chamber (3) through a spring (5), the moving contact (1) penetrates the cylinder (4) and is inserted into the arc extinguishing chamber (3), the moving contact (1) and the static contact (2) are provided with guide pins (6) at the periphery edges, the end of the cylinder (4) is further provided with a pressing rod (7), the periphery edge of the moving contact (1) is provided with a pressing ring (8) matched with the pressing rod (7); The side wall of the arc extinguishing chamber (3) is provided with a sandwich layer, a winding group (9) and an exhaust pipe (10) are arranged in the sandwich layer, the exhaust pipe (10) is in communication with the inside of the cylinder (4), and the inner wall of the arc extinguishing chamber (3) is provided with a nozzle (11) in communication with the exhaust pipe (10); The inner wall of the arc extinguishing chamber (3) is provided with an arc extinguishing ring (12), and the end of the arc extinguishing chamber (3) is further provided with an exhaust hole (13); When the moving contact (1) moves upward, the pressing ring (8) extrudes the pressing rod (7) to make the gas in the cylinder (4) sprayed from the nozzle (11) through the exhaust pipe (10) to the electric arc.

2. A high voltage switch contact structure according to claim 1, characterized in that: The cylinder (4) is in a circular ring structure and is filled with sulfur hexafluoride gas, the pressing rod (7) is in the inside of the arc extinguishing chamber (3), the gas outlet hole of the cylinder (4) is connected with the nozzle (11) through the exhaust pipe (10), the moving contact (1) can move up and down in the opening hole in the middle of the cylinder (4), and the outer diameter of the pressing ring (8) is greater than the diameter of the opening hole in the middle of the cylinder (4).

3. A high voltage switch contact structure according to claim 2, characterized in that: The number of the arc extinguishing rings (12) is several, and the arc extinguishing rings (12) are arranged equidistantly along the inner wall of the arc extinguishing chamber (3) from top to bottom, and the inner wall of the arc extinguishing ring (12) is annularly provided with sawtooth-shaped arc extinguishing teeth (14).

4. A high voltage switch contact structure according to claim 3, characterized in that: The guide pin (6) is in a conical structure, and a plurality of guide pins (6) are arranged in a ring shape.

5. A high voltage switch contact structure according to claim 4, characterized in that: The exhaust hole (13) is provided with a one-way exhaust valve.

6. A high voltage switch contact structure according to claim 5, characterized in that: The contact surface between the moving contact (1) and the cylinder (4) is provided with a sealing ring.

7. A high voltage switch contact structure according to claim 6, characterized in that: The bottom of the inner cavity of the arc extinguishing chamber (3) is provided with a limiting tube, and the static contact (2) is inserted into the limiting tube through a spring.

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